Comparison

EPA AIRNow vs Firesource

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

EPA AIRNow

Access real-time and forecasted air quality data for your local area and any other location. Plan your day and protect your health by understanding current air conditions.

Highlights
  • Current air quality information
  • Forecasted air quality
  • Local AQI display
  • Multiple area storage
  • Health protection planning
Features
Currently charting
Read full description

EPA's AirNow mobile app provides a simple interface for quickly checking current and forecast air quality information for planning daily activities and protecting your health. The app automatically displays the current AQI (Air Quality Index) for your local area or any area you wish to check, and allows you to store multiple areas for quick reference.

About

Firesource

Track live wildfires with real-time data on a map and in a feed. Access detailed fire perimeters, news updates, and air quality measurements. Users can also report nearby fires with photos and location data.

Highlights
  • Live fire map and feed
  • Real-time fire perimeters
  • Air quality measurements (AQI)
  • User-reported fire alerts
  • Satellite fire detections
  • News updates and reports
Features
Read full description

Firesource’s features: ◦ Live fire feed - both on map and in scrollable menu ◦ Local and national fire incidents - news updates and reports ◦ Fire perimeters - access all realtime fire perimeters at once with information about fire growth and progress, including acreage, containment, personnel, fire cause, and fire behavior ◦ Report a fire - instantly inform other users of a nearby fire by pressing the + button, taking a picture of the fire, and submitting ◦ Air quality - see the effects of recent fires by viewing realtime air quality measurements across the country ◦ Satellite fire detections can indicate new fires and how current fires are spreading National Fires (InciWeb, Cal Fire, IRWIN): InciWeb is an interagency incident management system run by the National Wildfire Coordinating Group. InciWeb collects wildfire incident data from several agencies across the United States and provides all of this data together in several feeds. Firesource presents wildfire incidents reported by InciWeb in real time, providing the fire’s location and detailed status. Learn more about InciWeb at their website: https://inciweb.nwcg.gov/. Learn more about Cal Fire, which also provides incident information, at their website: https://www.fire.ca.gov. Learn more about IRWIN, the data hub of fire reports, at https://www.forestsandrangelands.gov/WFIT/applications/IRWIN/. National Fires (Perimeters): Perimeter data is provided by the Wildland Fire Interagency Geospatial Services (WFIGS) Group and hosted in the National Interagency Fire Center ArcGIS Online Organization (The NIFC Org). Firesource displays fire perimeters and descriptions of their progress in the ‘National Fires’ tab of the menu, with this information updated on a regular basis. Learn more about the NIFC at their website: https://www.nifc.gov User-Reported Fires: Allowing app users to report a fire and immediately inform other users is an essential aspect of Firesource. To report a fire, press the yellow + button in the top right corner of the map, select the type of fire (vehicle fire, forest fire, terrain fire, structure fire), take a photo of the fire, and press submit. To ensure the validity of fire reports, the user must take a photo of the fire and cannot access Camera Roll to select a picture. Please note that submitting a fire report automatically creates the report at the user’s location, to further ensure that the fire is local and valid. When viewing user-reported fires in the feed, other users can ‘rate’ the fire report by confirming that it is active, contained, or a spam reporting. Air Quality: Air quality measurements from across the United States are collected from AirNow.gov, which provides national air quality data using the Air Quality Index (AQI). This data is color-coded to provide information about health concerns due to PM2.5 pollutants. Satellite-Detected Fires: Thermal hotspot detections are displayed and collected from NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS), which is an instrument on the Terra and Aqua satellites. Information provided from MODIS about each detection includes brightness (brightness temperature in Kelvin of a fire pixel) and confidence (quality of fire pixel). These fire detections are extremely useful, as they can indicate new fires and fire spread. Learn more about MODIS at their website: https://modis.gsfc.nasa.gov Firesource is not affiliated with any government agencies. Firesource is only available for iPhone and iPad in the United States, Canada, and Australia. Privacy Policy: https://firesourceapp.weebly.com/privacy-policy.html Learn more and contact us at https://firesourceapp.weebly.com/

Screenshots

EPA AIRNow4 screens
Firesource4 screens

Verdict

The call

The clearest difference is rating: Firesource at 4.7 against EPA AIRNow's 3.2. Firesource also leads on review sentiment (39% vs 27%) and ratings volume (2.7K vs 578). EPA AIRNow's advantage is chart position (#191 vs unranked). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Firesource holds the better App Store score, 4.7 against 3.2. Both are backed by a comparable volume of ratings — 578 and 2.7K respectively. Written reviews point the same way: 27% of EPA AIRNow's written reviews are positive against 39% of Firesource's.

UpkeepUpdate frequency

EPA AIRNow ships an update every 5 weeks, Firesource every 2 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard5 real differences · 6 level
EPA AIRNow versus Firesource: the parameters behind the verdict, then further details
ParameterEPA AIRNowFiresource
PriceFreeFree
Rating3.2 (578 ratings)4.7 (2.7K ratings) — better
Positive reviews26.7% of reviews38.6% of reviews — better
Number of ratings5782.7K — better
Update frequencyEvery 5 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
Best chart rank#191 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size40 MB38 MB
Age rating12+4+
DeveloperUnited States Environmental Protection Agency (USEPA)Hemal doshi

Customer experience

EPA AIRNow

All ratings578 ratings
Positive47.9%
Neutral10.9%
Negative41.2%
Written reviews135 reviews
Positive26.7%
Neutral12.6%
Negative60.7%

Firesource

All ratings2,536 ratings
Positive92.1%
Neutral4.4%
Negative3.5%
Written reviews44 reviews
Positive38.6%
Neutral13.6%
Negative47.7%

User reviews

EPA AIRNow

From 578 App Store ratings

What we love

  • 🚀 Easy to use
  • 🚀 Helpful for tracking air quality
  • 👍 Accurate information
  • 👍 Useful for asthmatic users
  • 👍 Assists with healthy living

Room to improve

  • 🐛 Not updating in real-time
  • 🐛 Inconsistent data across screens
  • 🐛 Crashes and freezes
  • 🐛 Inaccurate readings
  • 🐛 Incomplete coverage of locations

Firesource

From 2.7K App Store ratings

What we love

  • 🚀 Great for road closures
  • 👍 Nice app to have for fire research
  • 👍 Comprehensive fire records

Room to improve

  • 🐛 Inaccurate and outdated information
  • 🐛 Frequent crashes and app issues
  • 🐛 Slow performance
  • 👎 Limited coverage (no Canada, Australia)
  • 👎 Difficult to view fire perimeters

Bugs and requests

EPA AIRNow

Reported bugs

4 issues
  • Crashes when accessing details
  • Locations not showing up
  • Data not updating consistently
  • Incompatibility issues with newer devices

Requested features

5 requests
  • Add notification alerts for poor air quality
  • Improve map functionality and coverage
  • Allow customization of locations and settings
  • Provide more detailed air quality data
  • Increase update frequency

Firesource

Reported bugs

3 issues
  • Fires not showing up on the map
  • Air quality data not updating
  • App keeps logging users out

Requested features

3 requests
  • Horizontal view for iPad
  • Notifications for nearby fires
  • More detailed fire information (size, direction, containment)

In-app purchases

None

EPA AIRNow

No in-app purchases

None

Firesource

No in-app purchases

Questions

Is EPA AIRNow free?
EPA AIRNow is free to download, with no in-app purchases.
Is Firesource free?
Firesource is free to download, with no in-app purchases.
Which has better reviews, EPA AIRNow or Firesource?
Firesource is rated higher. EPA AIRNow averages 3.2 out of 5 from 578 ratings, while Firesource averages 4.7 from 2.7K ratings.
Do EPA AIRNow or Firesource have ads?
Neither EPA AIRNow nor Firesource shows ads.
Which is updated more often, EPA AIRNow or Firesource?
EPA AIRNow ships an update every 5 weeks, and Firesource every 2 months. Most recently, EPA AIRNow was updated on November 1, 2026 and Firesource on October 29, 2026.

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